translucent_bind

I have a translucent overlay on my ldap server (that add attributes to
my ldap_relay server)
I'd like to authenticate with password stored in my translucent server
because I have no write acecs in ldap_relay.

When I try to authenticate with my account, I got a ldap_bind: Invalid
credentials (49) error

I've tried all the encryptions method to encrypt userpassword

I've tried to set userpassword serch in local server ( If I search for
(userpassword=*) I have a correct answer, so user password search is
realy do in the local server)
but authentication doesn't work, I can see in log that request is send
to the remote server.

I there a way to tell local server to not send authentication request to
remote server ? Sample of my local slapd.conf is at the end of this message